--- pyproject.toml.orig	2026-07-10 18:11:46 UTC
+++ pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=77"]
+requires = ["setuptools>=61"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -8,8 +8,7 @@ requires-python = ">=3.9"
 description = "Fast MUTF-8 encoder & decoder"
 readme = "README.md"
 requires-python = ">=3.9"
-license = "MIT"
-license-files = ["LICENCE"]
+license = { text = "MIT" }
 authors = [{ name = "Tyler Kennedy", email = "tk@tkte.ch" }]
 keywords = ["mutf-8", "cesu-8", "jvm"]
 classifiers = [
@@ -38,10 +37,6 @@ packages = ["mutf8"]
 
 [tool.setuptools]
 packages = ["mutf8"]
-# optional=true so a failed compile falls back to the pure-Python mutf8/mutf8.py.
-ext-modules = [
-    { name = "mutf8.cmutf8", sources = ["mutf8/cmutf8.c"], language = "c", optional = true },
-]
 
 [tool.setuptools.dynamic]
 version = { attr = "mutf8.__version__" }